5.口算
80×90= | 240÷60= | 8×125= | 2100÷30= |
67-48= | 630÷9= | 340+150= | 52÷4= |
0.3×95≈ | 423×301≈ | 298×19≈ | 182×309≈ |
4.六时整,钟面上分针与时针所成的角是( )
0 161738 161746 161752 161756 161762 161764 161768 161774 161776 161782 161788 161792 161794 161798 161804 161806 161812 161816 161818 161822 161824 161828 161830 161832 161833 161834 161836 161837 161838 161840 161842 161846 161848 161852 161854 161858 161864 161866 161872 161876 161878 161882 161888 161894 161896 161902 161906 161908 161914 161918 161924 161932 199269
A. | 90° | B. | 180° | C. | 270° |